<?php // lint >= 7.4

function foo()   : Foo
{

}

$callback = function() : Foo
{

};

$callback = fn ($a) : Foo => $a;

interface Foo
{

	public function doFoo($param)   : Foo;

}

class FooBar implements Foo
{

	public function doFoo($param) : Foo
	{

	}

}
